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Mr. Himanshu Mehta 11 July 2008 Page 5 Phase 5: Class I Closure Design and Permitting Phase 5 consists of the design, permitting, and construction certification of the closure of the Segment 2 and Infill sideslopes up to El. 95 ft NGVD, divided in the following three tasks, as presented below, Task 5.1: Enzineerinz Design For budgeting purposes this task has been Under this phase, Geosyntec will perform engineering analysis and design for closure of the north and south slopes of Segment 2 and the Infill. Engineering analysis and design will be performed to the extent required in the closure permit application. Geosyntec will review, summarize, and synthesize all relevant previous work for the closure of the Class I sideslopes. Geosyntec will perform the following activities as part of the engineering design: • layout and grading of the sideslopes of Segment 2 and Infill; • specification of components and materials of the final cover system (vegetative layer, cap protective layer, as appropriate); • evaluation of percolation through and liquid head build-up in the final cover system using the hydrologic evaluation of landfill performance (HELP) model; • evaluation of stability and settlement of the final cover system; • design of the final cover drainage system to collect and convey the water that percolates through the vegetative and cap protective layers; • design of the surface water drainage system to collect and convey the storm water runoff from the final cover system to the perimeter toe ditch; • development of typical final cover system details (configuration of the final cover system at the side slope swales, and other details as appropriate) as required for the permit application; • development of a construction quality assurance (CQA) plan; and • development of financial assurance calculations. XR08168/JL80186.doc ��i�;inr�ers I scientists I innovators